<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<script language="JavaScript">
<!--
var i=1;
while(i<=7){
	document.write(i);
	document.write("<br>");
	i++;
}
var config='menubar=yes,toolbar=no,location=no,directories=no,status=yes,scrollbars=yes,resizable=yes,width=500,height=300';
window.open("www.seighday.com","seightday",config);
var x="google";
var y="x.bold():"+x.bold();
document.write(y.fontsize(7));
document.write(x.blink());
alert(x);
alert("success");

-->
</script>
<script language="JavaScript">
//测试null、空字符串、undefined、boolean类型的关系
var aa=null;
var bb="";
var cc=undefined;
alert("判断null与字符串是否相等");
alert(aa==bb);
alert("判断null与undefined是否相等");
alert(aa==cc);
alert("判断null与false是否相等");
alert(aa==false);
alert("判断null与true是否相等");
alert(!aa==true);

</script>
</body>
</html>